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Construction Stakeout at Norwalk Water Pollution Control Facility

Norwalk, Connecticut

Services: Land Surveying
Client Served: Government


The City of Norwalk secured a construction contract for improvements to their existing Water Pollution Control Facility located on the east side of the Norwalk River and within the footprint of a large municipal complex. The contract included improvements for the CSO/Wet Weather Preliminary Treatment System including a new building, grit handling equipment, septage receiving facilities and miscellaneous related utilities.

Loureiro provided survey services for the contractor performing the site and utilities package. Our services included location, alignment, cut-off and as-built surveys for 450 precast concrete friction piles supporting the proposed new building foundation and miscellaneous large-scale utilities. Loureiro also provided stakeout services for excavation limits, utility installations and miscellaneous site improvement features.

Due to the yielding nature of the underlying materials and the close proximity of several existing building structures to the proposed excavation, dewatering and pile advancement activities, Loureiro implemented a comprehensive settlement monitoring plan for the site to determine if the excavation, dewatering and/or pile installation activities were affecting any of the existing structures on the site. This plan included daily monitoring at select points located throughout the site on existing durable structures. The monitoring results were tabulated and submitted on a weekly basis to the Contract Administrator.

Highlights

  • Location, alignment, cut-off and as-built surveys for piles
  • Layout and alignment of significant coffer dam for dewatering
  • Utility alignment and invert staking
  • Excavation limit staking
  • Settlement monitoring throughout the site including building structures and utilities